Telos ZephyrExpress user manual Gather information about your Isdn line

was installed exactly as specified in the ISDN order instructions found at Telos’ web site and at the end of this manual.

∙Have circuit information supplied by the phone company. This must include the type of switch on the circuit and the telephone number(s)1. In the US, it will probably also include two SPID numbers. In Europe, it may include MSN numbers.

∙Have a ZephyrExpress, a microphone, and a pair of stereo headphones or other audio monitor.

∙Understand that these instructions are just to get you started and will not answer all of your questions or demonstrate all of the features of ZephyrExpress.

∙Promise to read the full manual later.

Now, let’s get started.

Gather information about your ISDN line

Analog telephones are simple: all a phone needs to do is tap into a line, and it’ll probably start working immediately.

ISDN is more complicated. Before any ISDN device can receive or transmit signals, it has to be matched to central office settings for that particular circuit. These settings include line identification numbers and a communication protocol.

Your ISDN circuit consists of two digital lines, and both can operate at the same time on a single copper pair. Each line has an identification number, which may (or may not) be its telephone number. Sometimes, both lines will use the same identification number.

The phone company’s equipment expects ZephyrExpress — or any other ISDN terminal equipment — to know the right identification numbers for the circuit it’s connected to, and to transmit them on demand. If the proper identification numbers aren’t entered into the equipment, you won’t be able to place or receive calls.

In North America, these numbers take the form of Service Profile Identification (SPID) numbers: If you’re given SPIDs, they must be programmed into ZephyrExpress.

The two lines also have standard telephone numbers, which users of other ISDN equipment will dial to call your ZephyrExpress. Unlike regular telephone lines, both lines may have the same telephone number assigned to them.

European telephone systems don’t use SPID. They may use optional Multiple Subscriber Numbers (MSNs) to limit which lines will be answered. If you put two MSNs into ZephyrExpress, the unit will answer calls only on those lines.

Confused? Here are some rules of thumb:

1There can be one or two standard phone numbers for a US circuit, and may be more than two for a European one.

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